## Introduction to 1.9.0

Kubernetes version 1.9 includes new features and enhancements, as well as fixes to identified issues. The release notes contain a brief overview of the important changes introduced in this release. The content is organized by Special Interest Group ([SIG](https://github.com/kubernetes/community/blob/master/sig-list.md)).

* Docker versions 1.10.3 - 1.12.3
  * Docker version 1.11.2 known issues
    - Kernel crash with Aufs storage driver on Debian Jessie ([#27885]((https://github.com/kubernetes/kubernetes/issues/27885))
      which can be identified by the [node problem detector](http://kubernetes.io/docs/admin/node-problem/)
    - Leaked File descriptors ([#275](https://github.com/docker/containerd/issues/275))

- CEL CRD validation expressions may now reference existing object state using the identifier `oldSelf`. ([#108073](https://github.com/kubernetes/kubernetes/pull/108073), [@benluddy](https://github.com/benluddy))

- Updated an audit annotation key used by the `…/serviceaccounts/<name>/token` resource handler.
  The annotation used to persist the issued credential identifier is now `authentication.kubernetes.io/issued-credential-id`. ([#123098](https://github.com/kubernetes/kubernetes/pull/123098), [@munnerz](https://github.com/munnerz)) [SIG Auth]

  - Added scheduler-owned field in `ResourceClaim.Status` to specify how much device capacity is reserved for a specific request.
  - Added an additional identifier to `ResourceClaim.Status` for the device supports multiple allocations.

## Non-user-facing Changes

* CRI now uses moutpoint as image filesystem identifier instead of UUID. ([#59475](https://github.com/kubernetes/kubernetes/pull/59475), [@Random-Liu](https://github.com/Random-Liu))

* You must now specify `Node.Spec.ConfigSource.ConfigMap.KubeletConfigKey` when using dynamic Kubelet config to tell the Kubelet which key of the `ConfigMap` identifies its config file. ([#59847](https://github.com/kubernetes/kubernetes/pull/59847), [@mtaufen](https://github.com/mtaufen))

{\n    //  content: \" (\" attr(href) \")\";\n    //}\n\n    abbr[title]::after {\n      content: \" (\" attr(title) \")\";\n    }\n\n    // Bootstrap specific; comment the following selector out\n    //\n    // Don't show links that are fragment identifiers,\n    // or use the `javascript:` pseudo protocol\n    //\n\n    //a[href^=\"#\"]::after,\n    //a[href^=\"javascript:\"]::after {\n    // content: \"\";\n    //}\n\n    pre {\n      white-space: pre-wrap !important;\n    }\n    pre,\n    blockquote...

  - Improve tests to work better with constrained resources
  - Add support for node auto-discovery
  - Add support for `--cloud-config`
  - Update group identifier to use for Cluster API annotations
  
  ### Exoscale
  - Add support for Exoscale
  
  ### GCE
  - Decrease the number of GCE Read Requests made while deleting nodes

    * Docker version 1.11.2 known issues

        * Kernel crash with Aufs storage driver on Debian Jessie ([#27885](https://github.com/kubernetes/kubernetes/pull/27885)) which can be identified by the [node problem detector](https://kubernetes.io/docs/tasks/debug-application-cluster/monitor-node-health/)

        * Leaked File descriptors ([#275](https://github.com/docker/containerd/issues/275))